1. Research Center for Exotic Nanocarbons
(JST), Shinshu University, 4-17-1 Wakasato,
Nagano-city 380-8553, Japan
2. Faculty of Textile Science and
Technology, Shinshu University, 3-15-1
Tokida, Ueda 386-8597, Japan
3. DuPont Company CR&D, Experimental Station, Wilmington, Delaware 19880, United States
4. Research Center for Advanced
Carbon Materials, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi Tsukuba,
Ibaraki 305-8565, Japan